. >>> an fbi investigative team finally arrives in benghazi to investigate the killing of 4 americans but they don't stay long and they need an escort. >>> winning a presidential debate is not just about what you say or don't say. it's also about how you say it, literally your facial expressions, gesture, posture. from the moment president obama and governor romney walked onstage last night, their body language was sending etc. own message. nothing escaped the cameras. according to the polls and pundits, mitt romney aced this part of the debate. many democrats accused president obama of giving a flat, uninspired performance. on the eve of the debate we talked to a body language expert who teaches at harvard business school. she told us what things to watch for. i got to say i'm usually very skeptical about this body language thing, but i find this woman very convincing and really interesting. a lot of things she talked about, i was watching for last night. tonight she breaks down the body language that won and lost the debate. here's gary tuchman. >> they shake, they touch, they talk.